Abstract

We examine manipulating electromagnetic waves in magnetic photonic crystals (MPCs) with external magnetic fields. We predict new giant magnetoreflectivity and giant magnetorefractivity effects: with an external magnetic field of a magnitude much smaller than the anisotropy field of the ferromagnet, the MPC can be changed from completely reflecting to nonreflecting with corresponding changes in the angle of refraction. Application to the storage of electromagnetic radiation is also discussed.

Comparison of the PB structures of the E modes for ω0=2.5c∕a (left panel) and ω0=2c∕a (right panel). The cutoff nc=7; that is, n runs from −7 to 7. For a typical ferrite, M0=1800 G, H0=3500 Oe; the present system corresponds to the case with a and R of the order of a millimeter.